chacha20.h

/*

 The MIT License (MIT)

 Copyright (c) 2017 The Bitcoin Core developers
 Copyright (c) 2024 bluezr
 Copyright (c) 2024 The Dogecoin Foundation

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
 OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.

*/

#ifndef __LIBDOGECOIN_CHACHA20_H__
#define __LIBDOGECOIN_CHACHA20_H__

#include <dogecoin/dogecoin.h>

LIBDOGECOIN_BEGIN_DECL

typedef struct chacha20 {
    uint32_t input[16];
    void (*setkey)(struct chacha20* this, const unsigned char* key, size_t keylen);
    void (*setiv)(struct chacha20* this, uint64_t iv);
    void (*seek)(struct chacha20* this, uint64_t pos);
    void (*output)(struct chacha20* this, unsigned char* c, size_t bytes);
} chacha20;

struct chacha20* chacha20_new();
struct chacha20* chacha20_init(const unsigned char* key, size_t keylen);
void chacha20_set_key(struct chacha20* this, const unsigned char* key, size_t keylen);
void chacha20_set_iv(struct chacha20* this, uint64_t iv);
void chacha20_seek(struct chacha20* this, uint64_t pos);
void chacha20_output(struct chacha20* this, unsigned char* c, size_t bytes);
void chacha20_free(struct chacha20* this);

LIBDOGECOIN_END_DECL

#endif // __LIBDOGECOIN_CHACHA20_H__